x = int(input())

if x < 30:print("No")
else:print("Yes")  x = int(input()) x int(input()) int input() input if x < 30:print("No")
else:print("Yes")  x < 30 x 30 x = int(input()) int(input()) x
x = int(input())

if x < 30:print("No")
else:print("Yes") 